CN100376973C

CN100376973C - Backlight structure

Info

Publication number: CN100376973C
Application number: CNB2005100746751A
Authority: CN
Inventors: 刘邦炫; 高克嘉
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2005-05-30
Filing date: 2005-05-30
Publication date: 2008-03-26
Anticipated expiration: 2025-05-30
Also published as: CN1687826A

Abstract

The present invention discloses a back light structure which comprises a light guide plate, a first light source group and a first reflecting sheet, wherein the light guide plate is provided with a first groove positioned on one side of the bottom of the light guide plate; the first reflecting sheet is arranged below the light guide plate and extended to the first groove, and a first light mixing zone is formed in the first groove; the first light source group is arranged on one side of the light guide plate and corresponds to the first groove.

Description

Backing structure

Technical field

The present invention relates to a kind of backing structure, particularly relate to a kind of LCD backlight structure.

Background technology

Please refer to Fig. 1, Fig. 1 illustrates the mixed light synoptic diagram of traditional backlight structure.In the LCD backlight structure 100 of side-light type, backlight generally is to utilize several light sources arrangements to form, as the light sources of light source 8, light source 9 and light source 10 compositions.Light source for example is a light emitting diode, and light source 8 for example is a red light emitting diodes, and light source 9 for example is a green LED, and light source 10 for example is a blue LED.Because backlight liquid crystal display is required to be even light and can makes light be entered in the substrate of LCD by exiting surface 7, therefore the light that provided of light source 8～10 need make light carry out mixed light earlier after entering the sidewall 3 of light guide plate 103, and the outer peripheral areas of exiting surface 7 just becomes the mixed light district.And because the directive property of light emitting diode is strong, therefore need the distance of mixed light also longer, and reduced the area of exiting surface 7 relatively, if backing structure 100 is by both sides (sidewall 3 and sidewall 5) while light inlet, then light mixing distance will be longer, and the display size of LCD will be subjected to bigger restriction.

In U.S. Patent Publication No. US2003/0043567, the light emitting diode that utilizes the configuration different colours is in the side of light guide plate, and the distance that reduces same color between light emitting diode can reduce the length of the required mixed light in mixed light district.Yet, nonetheless the length of exiting surface and width but still less than light guide plate the longest and width from, and can't make the display area of exiting surface identical with the surface area of light guide plate.

In patent announcement WO02097324, it is to enter in the light guide plate after configuration one light mixing plate mixes mixing with the light of the light emitting diode of different colours again.In this piece patent, though can effectively enlarge the display area of exiting surface, because light must pass through light mixing plate earlier, thereby reduced the optical efficiency of light, also increased the manufacture craft of necessary configuration light mixing plate simultaneously.Thereby the cost of increase manufacturing.

Summary of the invention

In view of this, purpose of the present invention is providing a kind of manufacture craft that do not need additionally to increase exactly, can effectively increase the display area of LCD backlight structure, makes the light guide plate display area of backing structure identical with the light guide plate area.

According to purpose of the present invention, a kind of backing structure is proposed.Backing structure comprises light guide plate, first light sources and first reflector plate, and light guide plate has first groove, is positioned at a side of light guide plate bottom.First reflector plate is disposed at the below of light guide plate and extends to first groove, makes and forms the mixed light district in first groove.First light sources is disposed at a side of light guide plate, corresponding to first groove.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:

Description of drawings

Fig. 1 is the mixed light synoptic diagram of traditional backlight structure;

Fig. 2 A is the backing structure stereographic map of first embodiment of the invention;

Fig. 2 B is the backing structure side view of first embodiment;

Fig. 3 is the backing structure side view of second embodiment;

Fig. 4 is the backing structure side view of the 3rd embodiment;

Fig. 5 is the backing structure side view of the 4th embodiment.

Embodiment

Embodiment one

Please refer to Fig. 2 A, it illustrates the backing structure stereographic map of first embodiment of the invention.Comprise light guide plate 202, first reflector plate 206, the first light sources 204a and secondary light source group 204b in the backlight liquid crystal display structure 200.Light guide plate 202 has the both sides that the first groove 208a and the second groove 208b lay respectively at light guide plate 202 bottoms.First reflector plate 206 is disposed at light guide plate 202 belows and extends to the first groove 208a and the second groove 208b, makes the first groove 208a and the second groove 208b form the first mixed light district and the second mixed light district respectively.Above the first groove 208a and the second groove 208b, form the first cantilever 211a and the second cantilever 211b.And first cantilever, 2 11a and the second cantilever 211b are positioned at side under the light guide plate end face 212.

Please be simultaneously with reference to Fig. 2 A and Fig. 2 B, Fig. 2 B illustrates the backing structure side view of first embodiment.When the light of the first light sources 204a and secondary light source group 204b generation entered between the first groove 208a and the second groove 208b, light formed the first mixed light district and the second mixed light district respectively between the first groove 208a and the second groove 208b.Present embodiment utilizes air dielectric to carry out mixed light and makes light become even light and enter light guide plate 202.When light enters in the light guide plate, the light of part is directly penetrated even light by several sites, bottom surface 218a that is disposed at light guide plate 202 bottoms, and the light of part enters among the first cantilever 211a and the second cantilever 211b via 206 reflections of first reflector plate.In the first cantilever 211a and the second cantilever 211b, utilize the configuration second reflector plate 210a in the bottom of the first cantilever 211a and the second cantilever 211b, will make uniform light can enter the end of cantilever.And the 3rd reflector plate 209a below the second reflector plate 210a is to enter in the light guide plate 202 in order to the light with first reflector plate 206 common pilots, the first light sources 204a and secondary light source group 204b.Wherein the reflecting surface of the second reflector plate 210a is towards the first cantilever 211a, and the reflecting surface of the 3rd reflector plate 209a is towards first reflector plate 206.In like manner, be configuration the 4th reflector plate 210b in the bottom of the second cantilever 211b, and the 4th reflector plate 210b below is configuration the 5th reflector plate 209b.In addition, also can make the second reflector plate 210a and the 4th reflector plate 210b directly become the structure of double-sided reflecting to replace the 3rd reflector plate 209a and the 5th reflector plate 209b respectively.In the first cantilever 211a and the second cantilever 211b, more utilize configuration several cantilever sites 218b to be disposed at the place, top of cantilever bottom, the uniform light that is positioned at the cantilever place is penetrated.In the present embodiment, if do not increase by the first cantilever 211a and the second cantilever 211b, when light that light sources produced through behind the mixed light directly by light guide plate 202 direct bright dippings, the width of its exiting surface is A, and behind the configuration first cantilever 211a and the second cantilever 211b, the mixed light zone is the first groove 208a and the second groove 208b, and the first cantilever 211a and the second cantilever 211b can increase the exiting surface of light guide plate 202, and width B of being drawn in the diagram and B ' are the width that light guide plate 202 exiting surfaces are increased.

Embodiment two

Please refer to Fig. 3, Fig. 3 illustrates the backing structure side view of second embodiment.Backing structure has the first light sources 304a and secondary light source group 304b, and be different from first embodiment be, in a second embodiment, the lower surface 317 of the first cantilever 311a of backing structure 300 and the second cantilever 311b is into an inclined-plane and also can reaches effect as first embodiment.In the present embodiment, configuration also can be omitted in configurable cantilever site.Configuration cantilever site can directly make the even light on the inclined-plane reveal light, does not then utilize the slope of adjusting the inclined-plane also can make light directly by the even bright dipping in inclined-plane if do not dispose.

Embodiment three

Please refer to Fig. 4, Fig. 4 illustrates the backing structure side view of the 3rd embodiment.Be different from first embodiment and second embodiment, the backing structure 400 of the 3rd embodiment only disposes a cantilever 411 on light guide plate 402, this embodiment utilizes first light sources 404 to be disposed at the monolateral or bilateral to carry out mixed light in first groove 408 of backing structure, treat that the light side behind the mixed light enters in the light guide plate 402, so that uniform light is by bright dipping in the light guide plate 402.

Embodiment four

Please refer to Fig. 5, Fig. 5 illustrates the backing structure side view of the 4th embodiment.What be different from first, second and third embodiment is that in the 4th embodiment backing structure 500, light guide plate 502 direct extensions are connected to first light sources, 504, the first light groups 504 and directly carry out mixed light in light guide plate 502.And the first cantilever 511a in the present embodiment also has the inclined-plane, make itself and 502 of light guide plate have an angle, and second reflector plate 510 is still corresponding to the configuration of first cantilever 511a below, 509 of the 3rd reflector plates are disposed on the light guide plate 502 of first cantilever 511a below, and also have an angle with second reflector plate 510.Simultaneously, more dispose optical cement, first light sources 504 directly is connected with light guide plate 502, thus, can reduce the energy of light mistake that mixed light consumes in air layer, and the efficient of mixed light is improved more in

first light sources

504 and 502 of light guide plate.Simultaneously, carry out, be increased so lighting area is the same with the above embodiments because the process of mixed light remains below first groove 508 below the cantilever.In addition, on the manufacture craft of light guide plate 502 be can injection mo(u)lding mode make, need not increase extra manufacture craft, just can reach increases the purpose that backlight efficiency improves the area of light guide plate exiting surface again simultaneously.

Disclosed backing structure of the above embodiment of the present invention and light guide plate are utilized the light guide plate with a cantilever design, and the exiting surface area that makes light guide plate is the summation of the area of the area of light conducting plate body and cantilever.Be compared to tradition and do not have a light guide plate of cantilever structure, increased the lighting area on the cantilever, and made light guide plate obtain bigger exiting surface area.

In sum; though disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention should be with being as the criterion that claim was defined.

Claims

1. backing structure comprises:

One light guide plate has one first groove, is positioned at a side of this light guide plate bottom;

One first reflector plate is disposed at the below of this light guide plate and extends to this first groove and enter first groove, makes and forms one first mixed light district in this first groove; And

One first light sources is disposed at a side of this light guide plate, corresponding to this first groove, and is in the outside of first groove.

2. backing structure as claimed in claim 1, wherein this backing structure also comprises a secondary light source group, with to one second groove that should light guide plate, this first groove and this second groove lay respectively at two sides of this light guide plate.

3. backing structure as claimed in claim 2, wherein this first, second light sources includes a plurality of light emitting diodes.

4. backing structure as claimed in claim 2, wherein this light guide plate forms one first cantilever above this first groove, above this second groove is to form one second cantilever.

5. backing structure as claimed in claim 4 also comprises one second reflector plate and one the 4th reflector plate, is disposed at this first and second cantilever bottom respectively.

6. backing structure as claimed in claim 5, also comprise the one the 3rd and the 5th reflector plate, be disposed at the below of this second and the 4th reflector plate respectively, wherein the reflecting surface of this second reflector plate is towards this first cantilever, and the reflecting surface of the 3rd reflector plate is towards this first groove; The reflecting surface of the 4th reflector plate is towards this second cantilever, and the reflecting surface of the 5th reflector plate is towards this second groove.

7. backing structure as claimed in claim 4 wherein more disposes a plurality of sites on the bottom of this light guide plate and this first, second cantilever.

8. backing structure as claimed in claim 4, wherein this first, second cantilever has more an inclined-plane.

9. backing structure as claimed in claim 3, wherein this second reflector plate has a two-sided reflection configuration.

10. backing structure as claimed in claim 2 wherein is to fill with an optical cement between this light guide plate and this first light sources and this secondary light source group.